EaseFunction

public enum EaseFunction

An easing function that determines the path used to get from point A to point B by calculating the position given a specific point in time.

These easing functions are based upon Robert Penner’s Easing Functions. A visualized cheat-sheet of these functions can be found at easings.net.

The aspect of time is crucial to motion — things change over time. Nothing can move in “zero time”, or be in two places at once. In other words, a position needs time to change, and it can have only one value at a specific point in time.

Because position and time have this one-to-one relationship, we can say that position is a function of time. This means that, given a specific point in time, we can find one, and only one, corresponding position.

- Robert Penner

Linear


                    
                    
                    linear(_:)

Calculates the y value for coordinate x using linear easing.

Declaration

Swift

public static func linear(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Sinusoidal


                    
                    
                    sineIn(_:)

Calculates the y value for coordinate x using sinusoidal-in easing.

Declaration

Swift

public static func sineIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    sineOut(_:)

Calculates the y value for coordinate x using sinusoidal-out easing.

Declaration

Swift

public static func sineOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    sineInOut(_:)

Calculates the y value for coordinate x using sinusoidal-in-out easing.

Declaration

Swift

public static func sineInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Cubic


                    
                    
                    cubicIn(_:)

Calculates the y value for coordinate x using cubic-in easing.

Declaration

Swift

public static func cubicIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    cubicOut(_:)

Calculates the y value for coordinate x using cubic-out easing.

Declaration

Swift

public static func cubicOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    cubicInOut(_:)

Calculates the y value for coordinate x using cubic-in-out easing.

Declaration

Swift

public static func cubicInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Quadratic


                    
                    
                    quadIn(_:)

Calculates the y value for coordinate x using quadratic-in easing.

Declaration

Swift

public static func quadIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quadOut(_:)

Calculates the y value for coordinate x using quadratic-out easing.

Declaration

Swift

public static func quadOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quadInOut(_:)

Calculates the y value for coordinate x using quadratic-in-out easing.

Declaration

Swift

public static func quadInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Quartic


                    
                    
                    quartIn(_:)

Calculates the y value for coordinate x using quartic-in easing.

Declaration

Swift

public static func quartIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quartOut(_:)

Calculates the y value for coordinate x using quartic-out easing.

Declaration

Swift

public static func quartOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quartInOut(_:)

Calculates the y value for coordinate x using quartic-in-out easing.

Declaration

Swift

public static func quartInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Quintic


                    
                    
                    quintIn(_:)

Calculates the y value for coordinate x using quintic-in easing.

Declaration

Swift

public static func quintIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quintOut(_:)

Calculates the y value for coordinate x using quintic-out easing.

Declaration

Swift

public static func quintOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    quintInOut(_:)

Calculates the y value for coordinate x using quintic-in-out easing.

Declaration

Swift

public static func quintInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Exponential


                    
                    
                    expoIn(_:)

Calculates the y value for coordinate x using exponential-in easing.

Declaration

Swift

public static func expoIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    expoOut(_:)

Calculates the y value for coordinate x using exponential-out easing.

Declaration

Swift

public static func expoOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    expoInOut(_:)

Calculates the y value for coordinate x using exponential-in-out easing.

Declaration

Swift

public static func expoInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Circular


                    
                    
                    circIn(_:)

Calculates the y value for coordinate x using circular-in easing.

Declaration

Swift

public static func circIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    circOut(_:)

Calculates the y value for coordinate x using circular-out easing.

Declaration

Swift

public static func circOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    circInOut(_:)

Calculates the y value for coordinate x using circular-in-out easing.

Declaration

Swift

public static func circInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Back


                    
                    
                    backIn(_:)

Calculates the y value for coordinate x using back-in easing.

Declaration

Swift

public static func backIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    backOut(_:)

Calculates the y value for coordinate x using back-out easing.

Declaration

Swift

public static func backOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    backInOut(_:)

Calculates the y value for coordinate x using back-in-out easing.

Declaration

Swift

public static func backInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Elastic


                    
                    
                    elasticIn(_:)

Calculates the y value for coordinate x using elastic-in easing.

Declaration

Swift

public static func elasticIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    elasticOut(_:)

Calculates the y value for coordinate x using elastic-out easing.

Declaration

Swift

public static func elasticOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    elasticInOut(_:)

Calculates the y value for coordinate x using elastic-in-out easing.

Declaration

Swift

public static func elasticInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].

Bounce


                    
                    
                    bounceIn(_:)

Calculates the y value for coordinate x using bounce-in easing.

Declaration

Swift

public static func bounceIn(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    bounceOut(_:)

Calculates the y value for coordinate x using bounce-out easing.

Declaration

Swift

public static func bounceOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].


                    
                    
                    bounceInOut(_:)

Calculates the y value for coordinate x using bounce-in-out easing.

Declaration

Swift

public static func bounceInOut(_ x: Double) -> Double

Parameters

`x`	The `x` coordinate to which the `y` value is returned, between [0, 1].

Return Value

The y value for coordinate x, between [0, 1].